VIDEO: The real soldier behind Mark Wahlberg's Lone Survivor

In the hard-hitting war biopic Lone Survivor Mark Wahlberg plays real life US Navy Seal Marcus Lauttrell. Lauttrell was the only survivor of a 2005 covert mission behind enemy lines in Afghanistan that went terribly wrong.

The film, which also stars Taylor Kitch, Eric Bana and Emile Hirsch, is an incredible, at times almost unbearable, portrayal of the desperate fight for survival of Lautrell and his team.

Lautrell himself was constantly on set to make sure the film was as accurate and realistic as possible, no matter how harrowing or upsetting it was.

You can see him in action in our exclusive clip from the Blu-ray extras.

Lone Survivor is available on Blu-ray and DVD now, courtesy of Universal Pictures (UK)